PHP XML To Array将XML转换为数组

// Xml 转 数组, 包括根键，忽略空元素和属性，尚有重大错误
function xml_to_array( $xml )
{
$reg = "/<(\\w+)[^>]*?>([\\x00-\\xFF]*?)<\\/\\1>/";
if(preg_match_all($reg, $xml, $matches))
{
$count = count($matches[0]);
$arr = array();
for($i = 0; $i < $count; $i++)
{
$key= $matches[1][$i];
$val = xml_to_array( $matches[2][$i] );  // 递归
if(array_key_exists($key, $arr))
{
if(is_array($arr[$key]))
{
if(!array_key_exists(0,$arr[$key]))
{
$arr[$key] = array($arr[$key]);
}
}else{
$arr[$key] = array($arr[$key]);
}
$arr[$key][] = $val;
}else{
$arr[$key] = $val;
}
}
return $arr;
}else{
return $xml;
}
}
// Xml 转 数组, 不包括根键
function xmltoarray( $xml )
{
$arr = xml_to_array($xml);
$key = array_keys($arr);
return $arr[$key[0]];
}

// 类似 XPATH 的数组选择器
function xml_array_select( $arr, $arrpath )
{
$arrpath = trim( $arrpath, '/' );
if(!$arrpath) return $arr;
$self = 'xml_array_select';

$pos = strpos( $arrpath, '/' );
$pos = $pos ? $pos : strlen($arrpath);
$curpath = substr($arrpath, 0, $pos);
$next = substr($arrpath, $pos);

if(preg_match("/\\[(\\d+)\\]$/",$curpath,$predicate))
{
$curpath = substr($curpath, 0, strpos($curpath,"[{$predicate[1]}]"));
$result = $arr[$curpath][$predicate[1]];
}else $result = $arr[$curpath];

if( is_array($arr) && !array_key_exists($curpath, $arr) )
{
die( 'key is not exists:' . $curpath );
}

return $self($result, $next);
}
// 如果输入的数组是全数字键，则将元素值依次传输到 $callback, 否则将自身传输给$callback
function xml_array_each( $arr, $callback )
{
if(func_num_args()<2) die('parameters error');
if(!is_array($arr)) die('parameter 1 shuld be an array!');
if(!is_callable($callback)) die('parameter 2 shuld be an function!');
$keys = array_keys($arr);
$isok = true;
foreach( $keys as $key ) {if(!is_int($key)) {$isok = false; break;}}
if($isok)
foreach( $arr as $val ) $result[] = $callback($val);
else
$result[] = $callback( $arr );
return $result;
}

/**
* 最简单的XML转数组
* @param string $xmlstring XML字符串
* @return array XML数组
*/
function simplest_xml_to_array($xmlstring) {
return json_decode(json_encode((array) simplexml_load_string($xmlstring)), true);
}